31223973 has 24 divisors (see below), whose sum is σ = 47951136. Its totient is φ = 17920800.

The previous prime is 31223971. The next prime is 31223989. The reversal of 31223973 is 37932213.

It is not a de Polignac number, because 31223973 - 2¹ = 31223971 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31223973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10603 + ... + 13223.

It is an arithmetic number, because the mean of its divisors is an integer number (1997964).

Almost surely, 2^31223973 is an apocalyptic number.

31223973 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31223973 is a deficient number, since it is larger than the sum of its proper divisors (16727163).

31223973 is a wasteful number, since it uses less digits than its factorization.

31223973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673 (or 2654 counting only the distinct ones).

The product of its digits is 6804, while the sum is 30.

The square root of 31223973 is about 5587.8415331861. The cubic root of 31223973 is about 314.8927929454.

The spelling of 31223973 in words is "thirty-one million, two hundred twenty-three thousand, nine hundred seventy-three".